gave the ^-C-glycoside 408 after decarboxylation . Under the influence of silver ion, the displacement of the anomeric bromide in 410 with the tin acetylide shown, gave the the a product 411 exclusively. Here, the stereochemical outcome is rationalized on the basis of attack of the formed oxonium from the a face under the influence of the anomeric effect . Similar chemistry has also been carried out
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